Corn Investigations 
133 
tested, 11.4 per cent were entirely disease free and 88.6 per cent 
showed more or less disease present, while 10.3 per cent of all 
were classified as very badly diseased. 
In an identification test of root-rot diseases made by T. F. 
Manns and J. F. Adams, pathologists of the Delaware Experi- 
ment Station, the unselected Nebraska White Prize corn used in 
these tests was found to be 20 per cent infected with Cephalo- 
sporium sacchari , 20 per cent infected with Fusarium monili- 
forme , and 20 per cent with Diplodia zeae. As an average for 
seed of the 1920 crop from fourteen different sources in Ne- 
braska, 44 per cent of infection with rot diseases was found. 
RELATION BETWEEN EAR TYPE AND PRESENCE OF ROOT -ROT DISEASES AS 
INDICATED BY THE GERMINATOR TEST 
Descriptive notes were taken individually of all 1,456 ears 
tested, regarding the following characters: (1) Ear length, (2) 
ear diameter, (3) ear weight, (4) roughness, (5) starchiness, 
(6) luster of germ, (7) moldiness, (8) kernel discoloration, (9) 
color of shank, and (10) soundness of shank. 
Those physical ear and kernel characters of Hogue’s Yellow 
Table 55. — Results of germinator test to determine amount of 
root-rot disease present in tivo standard varieties of dent 
corn groicn at the Nebraska Experiment Station (Hogue's 
Yellbw Dent and Nebraska White Prize). 1921. 
Classification of ears and kernels 
Variety tested 
Hogue’s 
Yellow 
Dent 
Nebraska 
White 
Prize 
Average 
Number of ears tested 
959 
9,590 
57.9 
23.8 
16.8 
1.5 
98.5 
14.4 
85.6 
10.6 
497 
4,970 
51.4 
34.9 
12.3 
1.4 
98.6 
8.5 
91.5 
10.0 
Total number of kernels tested 
Disease free kernels (per cent) 
Kernels diseased but not rotted (per cent) . . 
Kernels diseased and rotted (per cent) 
Kernels dead (per cent) 
Germination (per cent) 
Ears disease free (per cent) 
Ears diseased (per cent) 
Ears badly diseased (per cent) 1 
54.65 
29.35 
14.55 
1.45 
98.55 
11.45 
88.55 
10.30 
l “Ears badly diseased” refers in the case of Hogue’s Yellow Dent to 
ears of which five or more of the ten kernels tested showed disease accompanied 
by rotting. In case of the Nebraska White Prize, a number of ears were 
included which showed somewhat less rotting, but in such cases not less than 
eight of the ten kernels indicated disease. 
